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I can certainly see Ben making a pass at Vestara. But anything between those two will simply be a "physical" relationship. It'll be interesting to see how far they go with that, this being Star Wars in all. But I really don't think Ben is going to go Sith and join Vestara, and I don't think Vestara is going to "see the light" and become a Jedi. Whatever happens between those two is going to come to a crashing burn when Vestara reveals that this is just Sith tactics at work.